<html>
    <head>
        <title>Bob's bilyash shop</title>
    </head>
    <body>
        <h1>Bob's bilyash shop</h1>
        <h2>Order result</h2>
        
        <?php
        echo "<h3>You ordered: </h3>"; 
        define("TIREPRICE", 10);
        define("OILPRICE", 5);
        echo $_POST['tireqty']*TIREPRICE."<br>";
        echo $_POST['oilqty']*OILPRICE."<br>";
        ?>
        
</body>
</html>